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Stock-based Employee Compensation, Stock Option Plans, and Deferred Compensation Plan for Directors - Narrative (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |
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Jun. 30, 2023 | May 12, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 29, 2023
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred compensation (in shares) | 120,396 |  |  |  |  |  |  |  | 7,797 |  |
Shares due to exercise of employee stock options and issuance of directors' deferred stock |  |  | 895,000 | 3,104,000 | 699 | 3,191,000 | 19,618,000 | 8,007 |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  | $ 1,000,000 |  |
Future expense |  |  | $ 2,500,000 |  |  |  |  |  | $ 2,500,000 |  |
Exercised (in shares) |  |  |  |  |  |  |  |  | 0 |  |
Exercised |  |  |  |  |  |  |  |  | $ 0 | $ 179,217 |
Closing share price (in usd per share) |  |  |  |  |  |  |  |  |  |  | $ 35.27
Share-based compensation arrangement by share-based payment award, options, grants since inception (in shares) |  |  |  |  |  |  |  |  |  |  | 1,700,000
Weighted average remaining contractual life of the Company's outstanding options |  |  |  |  |  |  |  |  | 5 years 8 months 12 days |  |
Weighted average remaining contractual life of the Company's exercisable options |  |  |  |  |  |  |  |  | 4 years 4 months 24 days |  |
Granted (in shares) |  |  |  |  |  |  |  |  | 253,500 |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares due to exercise of employee stock options and issuance of directors' deferred stock |  |  |  |  |  |  |  |  | 8,225 |  |
Director And Certain Officers |  |  |  |  |  |  |  |  |  |  |
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 253,500 |  |  |  |  |  |  |  |  |
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expiration period |  |  |  |  |  |  |  |  | 10 years |  |
Employee Stock Option | Officers |  |  |  |  |  |  |  |  |  |  |
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  | 4 years |  |

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